Q.1
The chemical (Ethyl Mercaptan) added to the otherwise odourless LPG cooking gas for imparting a detectable smell to the gas is a compound of:
Q.2
The average salinity of seawater is
Q.3
When an iron nail gets rusted, iron oxide is formed
Q.4
Which of the following is not an isotope of hydrogen?
Q.5
The main constituents of pearls are
Q.6
Balloons are filled with
Q.7
Which of the following does not contain a coinage metal?
Q.8
Permanent hardness of water can be removed by adding:
Q.9
Marsh gas is
Q.10
Tetraethyl lead is used as
Q.11
Which of the following is used as a lubricant?
Q.12
From which mineral is radium obtained?
Q.13
What is laughing gas?
Q.14
Most soluble in water is:
Q.15
Which of the following was to be discovered first in the chromospheres of the sun?
Q.16
Quartz crystals normally used in quartz clocks etc. is chemically
Q.17
Which of the gas is not known as green house gas?
Q.18
Which of the following is used in pencils?
Q.19
Which of the following metals forms an amalgam with other metals?
Q.20
Soda water contains
Q.21
The element common to all acids is
Q.22
Non stick cooking utensils are coated with
Q.23
Galvanised iron sheets have a coating of
Q.24
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
Q.25
The gases used in different types of welding would include
Q.26
Actinides are the elements with atomic numbers from
Q.27
Which of the following is in liquid form at room temperature?
Q.28
Sodium metal is kept under:
Q.29
Bromine is a
Q.30
The hardest substance available on earth is
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